0, 56.7, 55.1, 53.9, 29.2, 27.2, 26.1, 25.9, 25.5, 20.5, 18.6, 18.2, 14.1, −4.4, −4.6, −5.2, −5.2. HRMS (ESI+): m/z calcd for C46H72N11O7Si2 [M+H]+: 884.4998, found: 884.5002.

4.1.15  9-[(2R,5R)-3-[2-({[(4R